Lixiviação de Ametryn e Clomazone+Hexazinone em Argissolo Vermelho Distroférrico

Abstract

The objective of this work was the evaluation of soil translocation of two herbicides used in sugarcane (Saccharum spp.) under a infiltration flux of 10, 20, 40, 80 and 160 mm of water. The experiment was done in a greenhouse in columns with medium texture soil and ametryn application, at 3 kg.ha-1, before emergence or a mixture of clomazone, at 1 kg.ha-1, and hexazinone, at 0,25 kg.ha-1. The herbicides translocation, in the soil profile was evaluated by Sorghum bicolor as an indicative plant. Ametryn lixiviated limitedly; on the other hand, the clomazone + hexazinone mixture was highly transposable to layers deeper than 20cm in the soil profile. The effects of clomazone + hexazinone mixture and ametryn herbicides were reduced in the first 5 cm in soil (dilution effect) when submitted to 160 mm of water. The mixture clomazone + hexazinone was more effective than ametryn in the suppression of sorghum even when submitted the excessive infiltration flux of water.